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B."],"published-print":{"date-parts":[[2022,6,8]]},"abstract":"<jats:p>A link between diet and avian intestinal anatomy is generally assumed. We collated the length of intestinal sections and body mass of 390 bird species and tested relationships with diet, climate and locomotion. There was a strong phylogenetic signal in all datasets. The total and small intestine scaled more-than-geometrically (95%CI of the scaling exponent &gt; 0.33). The traditional dietary classification (faunivore, omnivore and herbivore) had no significant effect on total intestine (TI) length. Significant dietary proxies included %folivory, %frugi-nectarivory and categories (frugi-nectarivory, granivory, folivory, omnivory, insectivory and vertivory). Individual intestinal sections were affected by different dietary proxies. The best model indicates that higher consumption of fruit and nectar, drier habitats, and a high degree of flightedness are linked to shorter TI length. Notably, the length of the avian intestine depends on other biological factors as much as on diet. Given the weak dietary signal in our datasets, the diet intestinal length relationships lend themselves to narratives of flexibility (morphology is not destiny) rather than of distinct adaptations that facilitate using one character (intestine length) as proxy for another (diet). Birds have TIs of about 85% that of similar-sized mammals, corroborating systematic differences in intestinal macroanatomy between vertebrate clades.<\/jats:p>","DOI":"10.1098\/rspb.2022.0675","type":"journal-article","created":{"date-parts":[[2022,6,1]],"date-time":"2022-06-01T03:06:20Z","timestamp":1654052780000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":21,"title":["Diet, habitat and flight characteristics correlate with intestine length in birds"],"prefix":"10.1098","volume":"289","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8431-2228","authenticated-orcid":true,"given":"Mar\u00eda J.","family":"Duque-Correa","sequence":"first","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, 8057 Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3841-6207","authenticated-orcid":true,"given":"Marcus","family":"Clauss","sequence":"additional","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, 8057 Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monika I.","family":"Hoppe","sequence":"additional","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, 8057 Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kobe","family":"Buyse","sequence":"additional","affiliation":[{"name":"Department of Veterinary and Biosciences, Faculty of Veterinary Medicine, Ghent University, Heidestraat 19, 9820 Merelbeke, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5223-9513","authenticated-orcid":true,"given":"Daryl","family":"Codron","sequence":"additional","affiliation":[{"name":"Department of Zoology and Entomology, University of the Free State, PO Box 339, 9300 Bloemfontein, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0175-1706","authenticated-orcid":true,"given":"Carlo","family":"Meloro","sequence":"additional","affiliation":[{"name":"Research Centre in Evolutionary Anthropology and Palaeoecology, Liverpool John Moores University, Liverpool, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1329-0911","authenticated-orcid":true,"given":"Mark S.","family":"Edwards","sequence":"additional","affiliation":[{"name":"California Polytechnic State University, San Luis Obispo, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2022,6]]},"reference":[{"key":"e_1_3_6_2_2","volume-title":"Comparative physiology of the vertebrate digestive system","author":"Stevens CE","year":"1995","unstructured":"Stevens CE, Hume ID. 1995 Comparative physiology of the vertebrate digestive system. 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